issues with spawn id <idx> not open when executing script from iTerm2

Question

I am trying to write a script and execute under iTerm2 profile. However whenever I open the new tab i run into this error. but I execute the same script on Terminal and no problem for it. anyone may know why?

expect: spawn id exp6 not open
`while { 1 } {
(file "xxxxx" line xx)
....

#!/usr/bin/expect

set username [lindex $argv 1]
set hostname [lindex $argv 2]
set password "abcd"
set timeout 60

# trap SIGWINCH and pass to spawned process
trap {
 set rows [stty rows]
 set cols [stty columns]
 stty rows $rows columns $cols < $spawn_out(slave,name)
} WINCH

spawn ssh -o NoHostAuthenticationForLocalhost=yes -o UseKeychain=yes $username@$hostname
while { 1 } {
    expect  "Are you sure you want to continue connecting (yes/no)" {
        send "yes\r"
    } "Enter passphrase for key " {
        interact
        break
    } "password:" {
        send "$password\r" 
    }
}

Answer 1

To expect several things simultaneously, don't use while use exp_continue

expect  {
    "Are you sure you want to continue connecting (yes/no)" {
        send "yes\r"
        exp_continue
    }
    "Enter passphrase for key " {
        interact
    }
    "password:" {
        send "$password\r"
        interact 
    }
}

• If you get the connection prompt, send yes and loop back to the expect statement.
• If you get prompted for the passphrase, just drop into interactive mode.
• If it's the password prompt, send the password prompt and go interactive.

When the user disconnects, interact will return, the expect statement returns, and the script exits.